CN113026348A - Preparation method and application of machine-washable electronic textile - Google Patents

Preparation method and application of machine-washable electronic textile Download PDF

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CN113026348A
CN113026348A CN202110307047.2A CN202110307047A CN113026348A CN 113026348 A CN113026348 A CN 113026348A CN 202110307047 A CN202110307047 A CN 202110307047A CN 113026348 A CN113026348 A CN 113026348A
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nwf
cnts
rgo
textile
prepared
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张煜舟
唐振华
李如龙
姚帝杰
邱宇浩
曾宏鑫
张莉
曾许毓昀
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Guangdong University of Technology
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    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06MTREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M11/00Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
    • D06M11/73Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof
    • D06M11/74Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof with carbon or graphite; with carbides; with graphitic acids or their salts

Abstract

The invention discloses a preparation method and application of a machine washable electronic textile, relating to the technical field of electronic textiles and having the technical scheme key points that: s1, preparing a CNTs/NWF sample; s2, preparing rGO/CNT/NWF; s3, carrying out ultrasonic washing on the NWFs on the rGO/CNTs/NWF textile prepared in the step S2 by adopting deionized water and isopropanol IPA, removing the part of rGOs with weak interaction with the NWFs, and drying at 60 ℃ to obtain the flexible wearable stress sensor sample based on the carbon nano tube/graphene composite material. The rGO/CNTs/NWF textile prepared by the method has high strain sensitivity, high heat conduction and high machine washing performance; meanwhile, in the method, the adhesion between the prepared carbon nano tube and the reduced graphene oxide and the NWF is stronger than that of the dipping method in the prior art; in addition, the rGO/CNTs/NWF textile prepared by the method can be applied to a wearable sensor to monitor the movement and pulse of a human body.

Description

Preparation method and application of machine-washable electronic textile
Technical Field
The invention relates to the technical field of electronic textiles, in particular to a preparation method and application of a machine washable electronic textile.
Background
The flexible electronic technology is a brand new electronic technology revolution, has important application prospects in the fields of medical treatment, information, energy, national defense and the like, and has attracted extensive attention of researchers. The flexible electronic technology not only integrates the technologies in the fields of electronic circuits, functional materials, micro-nano manufacturing and the like, but also spans industries such as semiconductors, packaging, detection, materials, chemical engineering, printed circuits, display panels and the like, and can also assist transformation and upgrading of traditional industries, such as plastics, printing, chemical engineering, metal materials and the like.
Electronic textiles are of great interest for their important applications in wearable electronic systems. These wearable electronic systems have important applications in many areas, such as robotics, healthcare, and athletic activity monitoring. Unlike conventional textiles, electronic textiles have electrical conductivity and sensing capabilities. Polymer composites with conductive nanofillers, such as graphene, carbon nanotubes, metal nanowires or metal nanoparticles, etc., are commonly used in electronic textiles. Dipping, dip-coating, drop casting, brush coating and ink-jet printing are common techniques for preparing conductive polymer composites. However, the nanofillers used in these processes typically have poor adhesion to the polymer and can be washed away during cleaning. Thus, the composite is not water washable. The electronic textile has good water washability and can be used for a long time. This can greatly reduce costs, is less toxic to human health, and is environmentally friendly. Efforts have been made to develop water washable electronic textiles.
Currently, in the prior art, there is a conductive polymer poly (3, 4-ethylenedioxythiophene): poly (styrene sulfonate) (PEDOT: PSS) dyed threads can be machine washed. In addition, there are polyethylene terephthalate/copper yarn fabrics prepared by chemical deposition methods. However, the resistance of the above fabrics after washing increased several times, and the copper layer on the PET yarn cracked after repeated washing. Therefore, in view of the above problems, hydrogel/elastomer fibers have been developed in the prior art, but the materials have high electrical resistance and harmful hydrazine is used, and the conductive wires and printed fabrics in the materials often lack mechanical elasticity and stretching ability and cannot withstand daily use and frequent washing.
In addition to electrical conduction, thermal management is another important issue for electronic textiles, since wearable electronics and circuits generate heat during operation, while the human body can tolerate only a narrow temperature range. High thermal conductivity may be required in order to quickly release heat to the environment. However, conventional garments and textiles generally have a very low thermal conductivity. In view of the above-mentioned situation in the prior art, the carbon-based material has a low density due to its extremely high thermal conductivity and high electrical conductivity, and thus is very attractive. For example, the thermal conductivity of CNTs can reach 3500w (mk), the thermal conductivity of graphene can even reach 5000w (mk)1, and the electrical conductivity can reach 6000Scm 1. In addition, graphene and CNTs can coexist with higher properties than a single component, including electrical conductivity, mechanical strength, or thermal conductivity. Thermal regulating textiles have attracted a wide interest for being able to provide personal cooling and thermal comfort.
Therefore, the present invention is directed to a method for preparing an electronic textile with high washability, high thermal conductivity, and high strain sensitivity, which solves the problems of the electronic textiles in the prior art.
Disclosure of Invention
The invention aims to provide a preparation method and application of a machine washable electronic textile, wherein the rGO/CNTs/NWF textile prepared by the method has high strain sensitivity, high heat conduction and high machine washing performance; meanwhile, in the method, the adhesion between the prepared carbon nano tube and the reduced graphene oxide and the NWF is stronger than that of the dipping method in the prior art; in addition, the rGO/CNTs/NWF textile prepared by the method can be applied to a wearable sensor to monitor the movement and pulse of a human body.
The technical purpose of the invention is realized by the following technical scheme: a preparation method of machine washable electronic textiles comprises the following steps:
s1, preparing CNTs/NWF, namely, carrying out ice bath on multi-walled carbon nanotubes (MWCNTs) in a cosolvent of isopropanol and deionized water (IPA/DI water), and fixing the multi-walled carbon nanotubes (MWCNTs) on the NWFs at the temperature of 0 ℃ under the ultrasonic action to prepare a CNTs/NWF sample;
s2, preparing rGO/CNT/NWF, flushing the CNTs/NWF sample prepared in the step S1 by using deionized water and Isopropanol (IPA) in an ultrasonic bath with the output power of 50W, then immersing the NWF anchored on the MWCNTs of the multi-walled carbon nano tubes into a graphene oxide aqueous solution for 15 minutes to prepare a GO/CNTs/NWF sample, then reducing GO in the GO/CNTs/NWF sample into rGO by using HI, and converting GO/CNTs/NWF into rGO/CNTs/NWF, namely preparing an rGO/CNTs/NWF textile;
s3, carrying out ultrasonic washing on the NWFs on the rGO/CNTs/NWF textile prepared in the step S2 by adopting deionized water and isopropanol IPA, removing the part of rGOs with weak interaction with the NWFs, and drying at 60 ℃ to obtain the flexible wearable stress sensor sample based on the carbon nano tube/graphene composite material.
Further, the ratio of the isopropyl alcohol to the deionized water in step S1 is 1: 5.
Further, the ice bath time described in step S1 was 15 minutes.
Further, the method for fixing the multi-walled carbon nanotubes (MWCNTs) on the NWFs in step S1 is: the CNTs are fixed to the NWF by nano-soldering.
The invention discloses an application of a preparation method of a machine washable electronic textile, which comprises the following steps: the prepared rGO/CNTs/NWF textile is applied to a wearable sensor to monitor the movement and pulse of a human body.
In conclusion, the invention has the following beneficial effects: the method adopts a mode of sequentially welding the carbon nano tubes and the reduced graphene oxide in a nano mode, fixes CNTs on NWF through nano welding, and then couples rGOs to the CNTs/NWF through the reduced graphene oxide, so that the rGO/CNTs/NWF textile is prepared, and the rGO/CNTs/NWF textile prepared by the method has high strain sensitivity, high heat conduction and high machine washing performance; meanwhile, in the method, the adhesion between the prepared carbon nano tube and the reduced graphene oxide and the NWF is stronger than that of the dipping method in the prior art; in addition, the rGO/CNTs/NWF textile prepared by the method can be applied to a wearable sensor to monitor the movement and pulse of a human body.
Drawings
FIG. 1 is a flow chart in an embodiment of the invention;
FIG. 2 is a histogram of the thermal conductivity of rGO/CNTs/NWF, CNTs/NWF, rGO/NWF and CNTs/rGO/NWF according to an embodiment of the present invention;
FIG. 3(a) shows the values of CNTs/NWF and rGO/CNTs/NWF in a 0-1.0% strain cycle tensile test of DG/G0 in the embodiment of the invention, and FIG. 3(b) shows the gauge factors of CNTs/NWF, rGO/CNTs/NWF and CNTs/rGO/NWF sensors when the strain in the embodiment is 1.0%;
FIG. 4(a) is the values for the maximum strain of 0.01%, 0.1%, 1% and 5% in the cycling test for the DG/G0, rGO/CNTs/NWF sensors of the examples of the invention, and FIG. 4(b) is the value for the maximum strain of 3000 or more replicates for the DG/G0, rGO/CNTs/NWF sensors at 1.0% strain for the examples of the invention;
FIG. 5 is a human body movement monitoring test chart of the rGO/CNTs/NWF strain sensor in the embodiment of the invention ((a) is finger bending and (b) is pulse);
FIG. 6 is an SEM image of the rGO/CNTs/NWF sensor before and after 48 hours of mechanical washing in water in an example of the invention: (a) before mechanical washing in water, (b) after mechanical washing in water for 48 hours.
Detailed Description
The invention is described in further detail below with reference to figures 1-6.
Example (b): a method for preparing a machine washable electronic textile, as shown in fig. 1, comprising the steps of:
s1, preparing CNTs/NWF, namely, performing ice bath on multi-walled carbon nanotubes (MWCNTs) in a cosolvent of isopropanol and deionized water (IPA/DI water) for 15 minutes, wherein the ratio of the isopropanol to the deionized water in the cosolvent is 1:5, and fixing the multi-walled carbon nanotubes (MWCNTs) on the NWFs by nano welding at the temperature of 0 ℃ under the ultrasonic action to prepare a CNTs/NWF sample;
s2, preparing rGO/CNT/NWF, flushing the CNTs/NWF sample prepared in the step S1 by using deionized water and Isopropanol (IPA) in an ultrasonic bath with the output power of 50W, then immersing the NWF anchored on the MWCNTs of the multi-walled carbon nano tubes into a graphene oxide aqueous solution for 15 minutes to prepare a GO/CNTs/NWF sample, then reducing GO in the GO/CNTs/NWF sample into rGO by using HI, and converting GO/CNTs/NWF into rGO/CNTs/NWF, namely preparing an rGO/CNTs/NWF textile;
s3, carrying out ultrasonic washing on the NWFs on the rGO/CNTs/NWF textile prepared in the step S2 by adopting deionized water and isopropanol IPA, removing the part of rGOs with weak interaction with the NWFs, and drying at 60 ℃ to obtain the flexible wearable stress sensor sample based on the carbon nano tube/graphene composite material.
In this embodiment, CNTs represent carbon nanotubes, NWF represents non-woven fabric, rGO represents reduced graphene oxide, and GO represents graphene.
The embodiment also provides an application of the preparation method of the machine washable electronic textile, which comprises the following steps: the prepared rGO/CNTs/NWF textile is applied to a wearable sensor to monitor the movement and pulse of a human body.
The invention is further illustrated by the test data below.
Preparation and characterization of rGO/CNTs/NWF textiles non-woven fabrics (NWFs) using polypropylene and viscose as main raw materials were widely used in this study due to their advantages of low cost, wide application range, eco-friendliness, etc. It has been found from research that nanosolding can anchor CNTs to NWFs. Although CNTs/NWF textiles have high strain sensitivity and good machine washability, they have poor thermal conductivity due to the separation of CNTs on the NWF. If two-dimensional graphene sheets can be affixed to NWFs by nano-soldering, they may form a continuous structure, thereby increasing thermal conduction. However, ultrasonication does not directly fix graphene on NWFs, because two-dimensional materials are difficult to penetrate into polymers. Thus, in the experiment, it was attempted to coat graphene flakes on non-nano fs and then fix carbon nanotubes as "nails" to the non-nano fs by nano-welding. However, since graphene has high mechanical strength, CNTs cannot penetrate graphene under the ultrasonic action, and this method fails. Then, in the experiment, the carbon nanotubes and the reduced graphene oxide are sequentially subjected to nano welding, the CNTs are fixed on the NWF through nano welding, and then the rGOs are coupled to the CNTs/NWF through the reduced graphene oxide.
The coexistence of carbon nanotubes and reduced graphene oxide can result in higher thermal conduction. As shown in FIG. 2, the thermal conductivity of rGO/CNTs/NWF is 2.90Wm1K1, which is significantly higher than that of NWF, CNTs/NWF, rGO/NWF and CNTs/rGO/NWF. While nano-soldering can anchor CNTs to NWF, they are separated and therefore only slightly increase thermal conductivity. Reduced graphene oxide sheets can improve thermal conductivity by bridging carbon nanotubes.
In this embodiment, Carbon Nanotubes (CNTs) are nano-welded into a non-woven fabric (NWF) by the preparation method of the present invention, and then reduced graphene oxide (rGO) is deposited by chemically reducing Graphene Oxide (GO). The measuring coefficient of the prepared rGO/CNTs/NWF textile can reach 32.651K 1 under the conditions that the tensile strain is 1% and the heat conduction is 2.90W m. Repeated washing does not affect the sensitivity, heat conduction and resistance of the electronic textile, and the electronic textile has the characteristic of high heat conductivity.
Materials that are resistance sensitive to strain may be used as strain sensors. FIG. 3(a) shows the change in DG/G, with a ratio of CNTs/NWF and rGO/CNTs/NWF to strain of 1.0%, and the conductance of both samples follows the stress-strain curve during the cycling test. Their reproducibility in the drawing cycle is clearly superior to rGO/NWF and CNTs/rGO/NWF. The results show that the bent carbon nanotubes are first straightened and flattened, thereby increasing the contact area between the carbon nanotubes. The gauge factor is defined as (DG/G)0) /(e), e applied strain, CNTs/NWF and rGO/CNTs/NWF sensors 23.96 and 32.65, respectively, at 1.0% applied tensile strain (FIG. 3 (b)). The gauge factor of the rGO/CNTs/NWF sensor is higher than that of CNTs/NWF, rGO/NWF and CNTs/rGO/NWF sensorsA sensor is provided. This measurement factor indicates an important application of rGO/CNTs/NWF in many fields, since it is much higher than that of the conventional sensor (B2).
The test also investigated the performance of rGO/CNTs/NWF at different maximum tensile strains from 0.01% to 5% (fig. 4 (a)). The strain sensor can detect fine strains as low as 0.01%. The maximum strains with measurement factors of 130.3, 71.8, 32.65, and 15.08 were 0.01%, 0.1%, 1%, and 5% (FIG. S5, ESI)
Figure BDA0002988205240000081
)。
Then, further testing was conducted to investigate the durability of the rGO/CNTs/NWF sensor, using cycles of rGO/CNTs/NWF sensor at 1.0% strain. As shown in fig. 4(b), the signal over 3000 cycles did not change significantly.
The rGO/CNTs/NWF sensor is used as a wearable sensor to be researched so as to monitor the movement of a human body. As shown in fig. 5(a), conductance varies with finger motion. The higher the degree of finger flex, the greater the conductance change. When the finger returns to the initial position, the conductance also returns to the initial value accordingly. It can also be mounted on the hand to monitor the pulse rate (as shown in fig. 5 (b)). The rGO/CNTs/NWF sensor can record the apparent body pulse waveform (diastolic, tidal and impulsive peaks) and pulse rate.
In addition, SEM and EDS results before and after mechanical washing of samples of rGO/CNTs/NWF textiles prepared in this example in water for 48 hours further demonstrate the water washability (as shown in fig. 6) and 6 machine wash cycles of rGO/CNTs/NWF textiles with detergent. After washing, both rGOs and CNTs remained on the NWFs with no significant change in carbon weight. In contrast, when the rGO/CNTs/NWF and CNTs/NWF samples were prepared by the dip casting method, no significant rGO or CNTs were observed after only 8 hours of washing. This also shows that the adhesion of the carbon nanotubes and reduced graphene oxide prepared by the method of the present invention in this example to NWF is much better than that of the impregnation method.
Through the experimental study, the rGO/CNTs/NWF textile prepared by the method disclosed by the invention has high strain sensitivity and high thermal conductivityAnd high machine washability. In the method of the invention in the embodiment, CNTs are welded into NWF in a nanometer mode, and then rGO is deposited. The thermal conductivity coefficient of the material can reach 2.90W m1K 1This is because of the continuous rGO/CNTs structure on the NWF. Meanwhile, the prepared rGO/CNTs/NWF high-thermal electronic textile has important significance for the thermal management of a wearable electronic system, the degree of correspondence is high, and the measurement factor under the tensile strain of 1.0% is 32.65. Therefore, it can be used as a pressure sensor to monitor the movement and pulse of the human body. Furthermore, electronic textiles are highly machine washable due to the penetration of CNTs through NWF and coupling of reduced graphene oxide to CNTs. They can be used as wearable sensors to monitor the movement of a human body in water.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims (5)

1. A preparation method of machine washable electronic textiles is characterized by comprising the following steps: the method comprises the following steps:
s1, preparing CNTs/NWF, namely, carrying out ice bath on multi-walled carbon nanotubes (MWCNTs) in a cosolvent of isopropanol and deionized water (IPA/DI water), and fixing the multi-walled carbon nanotubes (MWCNTs) on the NWFs at the temperature of 0 ℃ under the ultrasonic action to prepare a CNTs/NWF sample;
s2, preparing rGO/CNT/NWF, flushing the CNTs/NWF sample prepared in the step S1 by using deionized water and Isopropanol (IPA) in an ultrasonic bath with the output power of 50W, then immersing the NWF anchored on the MWCNTs of the multi-walled carbon nano tubes into a graphene oxide aqueous solution for 15 minutes to prepare a GO/CNTs/NWF sample, then reducing GO in the GO/CNTs/NWF sample into rGO by using HI, and converting GO/CNTs/NWF into rGO/CNTs/NWF, namely preparing an rGO/CNTs/NWF textile;
s3, carrying out ultrasonic washing on the NWFs on the rGO/CNTs/NWF textile prepared in the step S2 by adopting deionized water and isopropanol IPA, removing the part of rGOs with weak interaction with the NWFs, and drying at 60 ℃ to obtain the flexible wearable stress sensor sample based on the carbon nano tube/graphene composite material.
2. The method of manufacturing a machine washable electronic textile according to claim 1, comprising: the ratio of isopropanol to deionized water described in step S1 was 1: 5.
3. The method of manufacturing a machine washable electronic textile according to claim 1, comprising: the ice bath time described in step S1 was 15 minutes.
4. The method of manufacturing a machine washable electronic textile according to claim 1, comprising: the method for fixing the multi-walled carbon nanotubes (MWCNTs) to the NWFs in step S1 is: the CNTs are fixed to the NWF by nano-soldering.
5. Use of a process according to any one of claims 1 to 4 for the preparation of a machine washable electronic textile, characterized in that: the prepared rGO/CNTs/NWF textile is applied to a wearable sensor to monitor the movement and pulse of a human body.
CN202110307047.2A 2021-03-23 2021-03-23 Preparation method and application of machine-washable electronic textile Pending CN113026348A (en)

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Citations (2)

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Publication number Priority date Publication date Assignee Title
CN110344237A (en) * 2019-06-25 2019-10-18 广东工业大学 A kind of conducing composite material and the preparation method and application thereof
CN112504542A (en) * 2020-11-18 2021-03-16 广东工业大学 Application of sensitive material in flexible vacuum pressure sensor

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
CN110344237A (en) * 2019-06-25 2019-10-18 广东工业大学 A kind of conducing composite material and the preparation method and application thereof
CN112504542A (en) * 2020-11-18 2021-03-16 广东工业大学 Application of sensitive material in flexible vacuum pressure sensor

Non-Patent Citations (3)

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Title
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ZHENHUA TANG 等: "Highly conductive, washable and super-hydrophobic wearable carbon nanotubes e-textile for vacuum pressure sensors", 《SENSORS AND ACTUATORS A: PHYSICAL》 *
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Application publication date: 20210625